In the first reading today, there is no missing the straight-up idolatry. It is the classic text of the story from Exodus:
The LORD said to Moses, “Go down at once to your people whom you brought out of the land of Egypt, for they have become depraved. They have soon turned aside from the way I pointed out to them, making for themselves a molten calf and worshiping it, sacrificing to it and crying out, ‘This is your God, O Israel, who brought you out of the land of Egypt!’ The LORD said to Moses, “I see how stiff-necked this people is.
Even the Responsorial Psalm (Ps 106) gets in comment: “Our fathers made a calf in Horeb and adored a molten image; They exchanged their glory for the image of a grass-eating bullock.” The line is almost humorous if it weren’t so serious. And God’s reaction is as serious as it gets.